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SubjectRe: [Patch 8/8] kexec: allow to shrink reserved memory
KAMEZAWA Hiroyuki wrote:
> On Tue, 18 Aug 2009 14:31:23 +0800
> Amerigo Wang <amwang@redhat.com> wrote:
>
>>> It's hidden from the system before mem_init() ?
>>>
>>>
>> Not sure, but probably yes. It is reserved in setup_arch() which is
>> before mm_init() which calls mem_init().
>>
>> Do you have any advice to free that reserved memory after boot? :)
>>
>>
>
> Let's see arch/x86/mm/init.c::free_initmem()
>
> Maybe it's all you want.
>
> - ClearPageReserved()
> - init_page_count()
> - free_page()
> - totalram_pages++
>

Just FYI: calling ClearPageReserved() caused an oops: "Unable to handle
paging request".

I am trying to figure out why...



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